<!DOCTYPE HTML>
<html>
    <head>
        <title>Example</title>
    </head>
    <body>
        <script type="text/javascript">
        
            var firstVal = null;
            var secondVal;
            
            var equality = firstVal == secondVal;
            var identity = firstVal === secondVal;
    
            document.writeln("Equality: " + equality);
            document.writeln("Identity: " + identity);
            
        </script>        
    </body>
</html>
